Integrate WhatsApp with the software you already run

curl -X POST https://nawabiz.com/api/v1/messages \
  -H "X-Api-Key: $NAWABIZ_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "to": "+919876543210",
    "type": "template",
    "template": {
      "name": "order_shipped",
      "language": "en_US",
      "components": [
        { "type": "body",
          "parameters": [
            { "type": "text", "text": "10482" },
            { "type": "text", "text": "Thursday" }
          ] }
      ]
    }
  }'

const res = await fetch("https://nawabiz.com/api/v1/messages", {
  method: "POST",
  headers: {
    "X-Api-Key": process.env.NAWABIZ_API_KEY,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    to: "+919876543210",
    type: "template",
    template: {
      name: "order_shipped",
      language: "en_US",
      components: [
        { type: "body", parameters: [
          { type: "text", text: "10482" },
          { type: "text", text: "Thursday" },
        ] },
      ],
    },
  }),
});

const message = await res.json();   // 202 Accepted
console.log(message.id, message.wamId, message.status);

import os, requests

res = requests.post(
    "https://nawabiz.com/api/v1/messages",
    headers={"X-Api-Key": os.environ["NAWABIZ_API_KEY"]},
    json={
        "to": "+919876543210",
        "type": "template",
        "template": {
            "name": "order_shipped",
            "language": "en_US",
            "components": [
                {"type": "body", "parameters": [
                    {"type": "text", "text": "10482"},
                    {"type": "text", "text": "Thursday"},
                ]},
            ],
        },
    },
)

message = res.json()            # 202 Accepted
print(message["id"], message["wamId"], message["status"])

using var http = new HttpClient();
http.DefaultRequestHeaders.Add(
    "X-Api-Key", Environment.GetEnvironmentVariable("NAWABIZ_API_KEY"));

var response = await http.PostAsJsonAsync(
    "https://nawabiz.com/api/v1/messages",
    new
    {
        to = "+919876543210",
        type = "template",
        template = new
        {
            name = "order_shipped",
            language = "en_US",
            components = new object[]
            {
                new { type = "body", parameters = new object[]
                {
                    new { type = "text", text = "10482" },
                    new { type = "text", text = "Thursday" }
                } }
            }
        }
    });

// 202 Accepted
var message = await response.Content.ReadFromJsonAsync<JsonElement>();

A free-form text or media send outside WhatsApp's 24-hour customer service window is refused with 409 and the reason outside_window — only an approved template reopens the conversation. A contact marked OptedOut is never messaged by any route. Both rules are applied server-side, in the same place the inbox applies them, so your integration cannot drift from the app.